title: Salicylic acid involved in the regulation of nutrient elements uptake and oxidative stress in Vallisneria natans (Lour.) Hara under Pb stress.
abstract: In this study, the alterations in nutrient elements content, reactive oxygen species level and antioxidant response were studied in leaves of Vallisneria natans (Lour.) Hara exposed to salicylic acid (SA, 10 or 100 μM), or Pb (50 μM) or their combinations for 4d. No significant alterations in Mn and Ca content were observed but content of Cu, Zn, Fe and P decreased in plants exposed to SA alone. SA application inhibited the uptake of Pb and partially reversed Pb-induced the alterations in Mn, Ca and Fe content in leaves of V. natans exposed to 50 μM Pb. The decreased chlorophyll (a+b) and increased malondialdehyde and O(2-) and H(2)O(2) content were detected in plants exposed to 100 μM SA, 50 μM Pb, 10 μM SA+50 μM Pb or 100 μM SA+50 μM Pb. Application SA partially inhibited Pb-induced the increase of malondialdehyde, O(2-) and H(2)O(2) content. 100 μM SA decreased the activity of NADH oxidase and the content of non-protein thiols, carotenoids and ascorbic acid and increased the content of dehydroascorbate in plants treated with or without Pb. SA alone decreased the ascorbate peroxidase activity and increased the catalase and peroxidase activity, while SA application increased catalase activity but had no significant effect on ascorbate peroxidase and peroxidase activity in V. natans exposed to Pb. The results indicate that SA involves in the regulation of Pb uptake, nutrient balance and oxidative stress.
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Xikang Road No. 1, Gulou District, Nanjing 210098, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: Songhe
authors.initials: S
authors.lastname: Zhang
authors.forename: Peifang
authors.initials: P
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Hou
authors.forename: Jin
authors.initials: J
authors.lastname: Qian
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Ao
authors.forename: Jie
authors.initials: J
authors.lastname: Lu
authors.forename: Li
authors.initials: L
authors.lastname: Li
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D031321:Hydrocharitaceae / Q000187:drug effects* / Q000378:metabolism; D007854:Lead / Q000633:toxicity*; D015227:Lipid Peroxidation / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects; D020011:Protective Agents / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D020156:Salicylic Acid / Q000494:pharmacology*; D012989:Soil Pollutants / Q000633:toxicity*; D014131:Trace Elements / Q000378:metabolism
chemical_list: D020011:Protective Agents; D017382:Reactive Oxygen Species; D012989:Soil Pollutants; D014131:Trace Elements; D002734:Chlorophyll; D007854:Lead; D020156:Salicylic Acid